Studies on Damage Detection Using Frequency Change Correlation Approach for Health Assessment

Damage Location Assurance Criteria (DLAC) which is a correlation based approach between vectors of experimental natural frequency change ratios with vectors of analytical natural frequency change ratios, is adopted in this study for damage assessment. Here, the focus is on damage detection and correlation-based localization. For this study, numerical models of cantilever beam with three different damage locations have been modelled using finite element tool. Decreased mass is considered in this study to incorporate as damage. Natural frequencies for the first four modes are arrived for both undamaged and the damaged state of the structures. The damage incorporated is in the range of 10 percent of mass. From the correlation analysis carried out, the locations of the damage are matching with that of the damage considered. Further, to automate the correlation based algorithm, coding is developed using MATLab.